A method for recovering and utilizing terephthalic acid to produce organic matter in tail gas
A technology of terephthalic acid and organic matter, which is applied in the field of recycling organic matter in the tail gas produced by terephthalic acid, can solve the problems of increasing the consumption of PX and acetic acid, and achieve significant economic benefits
Inactive Publication Date: 2011-12-28
SHAOXING YUANDONG PETROCHEM
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- Description
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Problems solved by technology
Visible, this treatment method, although finally waste gas discharges up to standard, but a large amount of organic matter in tail gas is burnt and burnt and is not recovered, has increased the PX of unit mass PTA product and acetic acid consumption (MA is PX oxidation reaction by-product, comes from HAc )
Method used
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Embodiment 1
[0033] The tail gas flow rate of a certain 600,000 tons / a PTA plant is 199.9t / h, containing MA=2905ppm, PX=999ppm, after the tail gas passes through the high-pressure absorption tower 4, the tower low absorption liquid obtained by absorbing contains MA 583kg / h (concentration is 1.25 wt%), PX 201kg / h (concentration is 0.429wt%), after this absorption liquid passes through methyl acetate purification tower 1818, finally obtains MA product 513kg / h (containing MA is 96.5wt%) from MA overhead distillate , sent to the MA hydrolysis unit; the methyl acetate purification tower 18 bottom contains PX 200kg (concentration is 0.434wt%), returns to the PX oxidation reactor for reuse. The gas from the top of the high-pressure absorption tower first enters the expander to recover energy, and then goes to the RTO for purification. For this reason, 307kg / h of natural gas needs to be added to the RTO. Like this, after PTA tail gas is processed by the method of the present invention, can reclaim...
Embodiment 2
[0037] This example is an implementation example of methyl acetate purification tower 18.
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Abstract
The invention discloses a method for recycling and utilizing organic matter in the tail gas produced by terephthalic acid. The tail gas produced by terephthalic acid is fed into a high-pressure absorption tower to absorb p-xylene, methyl acetate and acetic acid in the tail gas; the high-pressure absorption tower The bottom absorption liquid is sent to the methyl acetate purification tower, and the overhead distillate of the methyl acetate purification tower contains more than 93wt% of methyl acetate, and is sent to the methyl acetate hydrolysis device for hydrolysis to obtain acetic acid and methanol, and the acetic acid is returned to the dehydration tower, and the methanol can be As fuel for personal use or takeaway; the p-xylene absorbed from the tail gas stays at the bottom of the methyl acetate purification tower, and returns to the p-xylene oxidation reactor together with the bottom discharge. The present invention recovers the p-xylene and methyl acetate in the tail gas, and fully utilizes the recovered methyl acetate and p-xylene through the methyl acetate purification tower and the methyl acetate hydrolysis device, thereby significantly reducing the amount of terephthalic acid The unit consumption of p-xylene and acetic acid of the product and the by-product of methanol are obtained, so the economic benefit is very significant.
Description
technical field [0001] The invention relates to a method for recovering and utilizing organic matter in the tail gas produced by terephthalic acid. The tail gas comes from the oxidation section of the terephthalic acid production process. Background technique [0002] Purified Terephthalic Acid (PTA) is the main raw material for the production of polyester fibers and resins. At present, it is mainly produced by the air oxidation method of p-Xylene (PX). In the device, the raw material PX is dissolved in the acetic acid-water solvent containing catalyst cobalt acetate, manganese acetate, hydrogen bromide (or tetrabromoethane), and air or oxygen-enriched is passed through for oxidation to generate solid product terephthalic acid. The typical reaction temperature is 155~205℃, the pressure is 0.6~1.6MPa (absolute pressure), the residence time is 40~120min, and the reaction heat is removed by the solvent acetic acid and water evaporation. The top outlet gas of the PX oxidation r...
Claims
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IPC IPC(8): B01D53/14C07C63/26C07C51/265
Inventor 谢刚徐海波卢晓飞
Owner SHAOXING YUANDONG PETROCHEM